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YB8 Fuel reserve switch

 
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Andysmoto



Joined: 28 Mar 2021
Posts: 2
Location: New Zealand

PostPosted: Sun Mar 28, 2021 12:28 am    Post subject: YB8 Fuel reserve switch Reply with quote

Hi I have a YB8 in for servicing and need some info on the fuel reserve switch.
Is reserve on when the light is on and main tank when light is off?
Also chrome rocker switch next to light switch l/h handlebar, what is this for?
Thanks Andy
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 564
Location: NE London

PostPosted: Sun Mar 28, 2021 9:39 am    Post subject: YB8 fuel reserve switch Reply with quote

The main fuel tap is permanently set to on by the lever on it. When the part of the fuel tank that the main fuel tap draws on is exhausted, the push button on the dash can be pushed until it illuminates, which activates a solenoid fuel tap which accesses the fuel in the tank that is not accessible by the main tap.

There wasn’t a chrome switch on the handlebar when the bike left the factory, so I don’t know what that does. But if I was to speculate, I would say that the dash reserve switch has failed and given that they’re no longer available, a previous owner has installed an alternative way of actuating the solenoid tap.
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Bud977



Joined: 03 Mar 2013
Posts: 525
Location: Sydney

PostPosted: Sun Mar 28, 2021 7:50 pm    Post subject: Reply with quote

When the fuel level drops, the low level switch drops out on one cylinder to let you know you're going to run out of fuel, and the light on the dash comes on. You press the light to acknowledge the need for fuel, and the bike goes back on 4 cylinders.
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Andysmoto



Joined: 28 Mar 2021
Posts: 2
Location: New Zealand

PostPosted: Mon Apr 05, 2021 1:28 am    Post subject: Reply with quote

Thanks Guys.

I'll pass this onto the owner when he collects the bike.
Very helpful information.
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Yellow02Z06



Joined: 11 Oct 2023
Posts: 3
Location: United States

PostPosted: Fri Sep 20, 2024 10:21 pm    Post subject: Reply with quote

Glad this info was here - I just got a YB8. When I test rode it, noticed an illumination on dash....forgot to ask what it was.

Took off the 1 pc tank/air box cover/seat/tail to look for a manual etc. now that bike is home.

Notice a fuel tank strap seeming to be missing so lifted up tank, found strap, but saw fuel tap and it was off.

So then I saw this thread and it all makes sense!

Only thing i was wondering is should tap be off to avoid flooding engine in case of tap failure and float seat seal failure...but since it has an electric fuel pump and carbs are above it I guess theres no real risk and tap can stay on?...I guess its ony there to drain the tank when needed
_________________
1997 YB8 Evo
2011 FJR1300
1987 GSX-R750
1987 SDR200
1986 VF500F
1986 RG500 Gamma
1985 GPz900R
1985 RZ350
1983 CB1100F
1977 XS400
1975 GT250
1974 CL200
1973 H1 500
1971 A7 350
2014 Stelvio
2008 Civic Si Coupe
2001 360 Spyder
1988 328 GTS
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 564
Location: NE London

PostPosted: Sun Sep 29, 2024 5:23 pm    Post subject: YB8 Reply with quote

If the fuel tap with the lever still works, i.e. still delivers fuel when on, it can be left turned on all the time. You’re quite right, the pump holds fuel at bay when the ignition is not turned on.

The thing to focus on is that if one of the fuel lines gets trapped between the tank and the motor, when you drop the tank back in, that line will kink/crush once the motor is warm and the bike will suffer fuel starvation. If somebody has turned off the main fuel tap and left the reserve tap permanently on, it suggests that the line from the main tap needs re-routing. It’s surprisingly difficult to get the routing right because until the motor’s warm the hose will not kink/crush, kidding you that you’ve got it right. Experiment, but always take the tools with you, so that you don’t get stranded. The secret is to use a pingel 2 into 1 fuel filter and a quick connector.

Good luck and enjoy the YB.
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 564
Location: NE London

PostPosted: Sun Sep 29, 2024 5:23 pm    Post subject: YB8 Reply with quote

If the fuel tap with the lever still works, i.e. still delivers fuel when on, it can be left turned on all the time. You’re quite right, the pump holds fuel at bay when the ignition is not turned on.

The thing to focus on is that if one of the fuel lines gets trapped between the tank and the motor, when you drop the tank back in, that line will kink/crush once the motor is warm and the bike will suffer fuel starvation. If somebody has turned off the main fuel tap and left the reserve tap permanently on, it suggests that the line from the main tap needs re-routing. It’s surprisingly difficult to get the routing right because until the motor’s warm the hose will not kink/crush, kidding you that you’ve got it right. Experiment, but always take the tools with you, so that you don’t get stranded. The secret is to use a pingel 2 into 1 fuel filter and a quick connector.

Good luck and enjoy the YB.
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Yellow02Z06



Joined: 11 Oct 2023
Posts: 3
Location: United States

PostPosted: Tue Oct 08, 2024 2:57 am    Post subject: Re: YB8 Reply with quote

Jonny B Bad wrote:
If the fuel tap with the lever still works, i.e. still delivers fuel when on, it can be left turned on all the time. You’re quite right, the pump holds fuel at bay when the ignition is not turned on.

The thing to focus on is that if one of the fuel lines gets trapped between the tank and the motor, when you drop the tank back in, that line will kink/crush once the motor is warm and the bike will suffer fuel starvation. If somebody has turned off the main fuel tap and left the reserve tap permanently on, it suggests that the line from the main tap needs re-routing. It’s surprisingly difficult to get the routing right because until the motor’s warm the hose will not kink/crush, kidding you that you’ve got it right. Experiment, but always take the tools with you, so that you don’t get stranded. The secret is to use a pingel 2 into 1 fuel filter and a quick connector.

Good luck and enjoy the YB.
Thanks for the response - I have indeed been able to leave it on, and have not had any problems...it seems to be routed correctly...

I have ridden it 4 or 5 times, after getting new tires on...what a bike!

I do have a rear brake issue...will post separately..
_________________
1997 YB8 Evo
2011 FJR1300
1987 GSX-R750
1987 SDR200
1986 VF500F
1986 RG500 Gamma
1985 GPz900R
1985 RZ350
1983 CB1100F
1977 XS400
1975 GT250
1974 CL200
1973 H1 500
1971 A7 350
2014 Stelvio
2008 Civic Si Coupe
2001 360 Spyder
1988 328 GTS
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